Year 410 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Mamercinus and Volusus (or, less frequently, year 344 Ab urbe condita). The denomination 410 BC for this year has been used since the early medieval period, when the Anno Dominicalendar era became the prevalent method in Europe for naming years.

Alcibiades installs a garrison at Chrysopolis under Theramenes to exact a tithe from all shipping that comes from the Black Sea. This revenue enables the Athenians to put an end to the regime of the Five Thousand and restore their traditional institutions in full. Democracy is restored in Athens. The new demagogueCleophon dismisses peace overtures made by Sparta.